(a) Subject matter. The regulations contained in this part are applicable to adverse decisions made by an agency, including, for example, those with respect to:

1. (1) Denial of participation in, or receipt of benefits under, any program of an agency;
2. (2) Compliance with program requirements;
3. (3) The making or amount of payments or other program benefits to a participant in any program of an agency; and
4. (4) A determination that a parcel of land is a wetland or highly erodible land.